GMAX 3900/5900/5900HD/7900
Quick Operator’s Guide
This procedure is for water-base paints and flushing fluids. For solvent-base paints and flushing
fluids (i.e. mineral spirits), you must read Fire and Explosion Hazard in the Operating Instructions.
WARNING
* check the Graco operations manual delivered with the unit for more details.
SETUP
2
1
Connect hose to sprayer and gun.
Unscrew tip
Tighten hose connections with wrench. & guard from gun.
Place siphon tube in pail
partially filled with water.
Turn pressure control knob
to lowest pressure, and
set power switch to ON.
Make sure safety lever
of gun is OFF.
Aim gun at inside
wall of water pail
and squeeze trigger.
Increase pressure until
sprayer starts. Keep gun
triggered into water
pail for 1 minute.
Release trigger.
Increase pressure until
sprayer starts and paint
comes out of drain tube.
Keeping gun triggered into
water pail, turn prime valve
to Spray position (horizontal).
Turn prime valve
to Prime position (down).
Make sure
power switch
is set to OFF.
Fill throat packing nut
with TSL to prevent
premature packing wear.
3
Check oil level of
motor and pump.
Increase pressure until
sprayer starts and water
runs out of prime tube.
Let water run out of prime
tube for 15 seconds.
Turn prime
valve to Prime
position (down).
When paint comes out of
gun, release trigger and turn
safety lever of gun to ON.
Transfer drain
tube to paint pail.
Cold engine starts.
Decrease pressure
until sprayer stops.
Place siphon tube in paint
pail, but leave drain tube
in water pail.
Turn prime valve
to Spray position
(horizontal).
Aim gun at inside wall
of water pail, and
squeeze trigger.
Screw tip & guard onto gun, making sure arrowshaped handle of tip is pointing forward. You
can reverse this tip to quickly clear clogs without
taking it apart.
CHOOSE THE RIGHT TIP (286-XXX) & FILTER
ins
ta
s/S
k
In
109 111
207 209 211
307 309 311
409 411
509 511
609 611
Flow Rate (l/min.)
Pump Filter (mesh)
Gun Filter (mesh)
.20
200 (orange)
100 (orange)
s
s
nt
ler
ce
Fil
es
k
m
u
oc
Bl
Int
s
s
s
ls
ne
on
er
cs
x
me etha
lsi
qu
yli
a
u
r
te
c
n
c
r
E
La
A
U
La
Em
113
213
313
413
513
613
115
215
315
415
515
615
121
221
321
421
521
621
721
815 817 819 821
917
.33 .49 .69 .91 1.17 1.47
100 (blue)
60 (black)
100 (orange)
60 (blue)
217
317
417
517
617
119
219
319
419
519
619
223
323
423
523
623
723
225
325
425
525
625
725
h
idt
W
n
Fa
235
327
331
427 429
433
527 529 531 533
627 629 631 633
729
827
831 833
435 439 443
451 455
543
551 555
635
645
655
735
835
935
2.15 2.54 2.96 3.42 3.90 4.42 4.98 6.18 7.51 8.23 10.57 12.99
30 (grey)
none
none
www.graco.be
4
5 cm
10 cm
15 cm
20 cm
25 cm
30 cm
35 cm
40 cm
45 cm
SPRAYING
Point gun at area to be sprayed about 30 cm from surface, and begin moving gun before triggering. A good spray pattern is evenly distributed
as it hits surface. Set pressure just high enough to spray without heavy edges. Use smaller tip size for thinner material and a larger tip size for
thicker material if pressure adjustment cannot achieve even spray pattern.
Turn safety lever
of gun to OFF.
SHUTDOWN AND CLEANUP
Set power
switch to OFF.
Turn prime valve
to Prime position
(down).
Trigger gun
until pressure
is relieved.
Unscrew tip & guard from
gun. Clean gun
filter, inlet screen, tip,
guard and manifold filter
with water and brush.
* for AutoClean™: see bottom of this page.
Remove gun filter
assembly.
Turn pressure control knob to
lowest setting, set power
switch to ON, and increase
pressure until sprayer starts.
Let sprayer run and flush
itself for 2 minutes.
Place drain
tube and
siphon tube in
pail of water.
WASTE
Place drain tube in waste Set power switch to ON,
pail and siphon tube in
and increase pressure
container of Pump Armor.™ until sprayer starts.
As soon as Pump Armor
comes out of drain tube,
set power switch to OFF.
Remove manifold
filter and spacer.
Keeping gun triggered
into water pail, turn
prime valve to Spray
position (horizontal).
Screw inlet screen onto
siphon tube, replace manifold filter and spacer, and
assemble gun with filter,
tip and guard.
Assemble gun
without filter.
Keep gun
triggered into pail
for 1 minute, until
water coming out
of gun is clean.
Unscrew inlet screen
from siphon tube.
Set power switch to OFF, turn
pressure control knob to lowest
setting, and turn prime valve to
Prime position (down).
Wipe outside of sprayer,
hose and gun with rag
soaked in water or
mineral spirits.
Fill throat packing
nut with TSL.™
AUTOCLEAN™ GUIDE
Remove suction and drain tubes
from paint. Place drain tube into
waste pail and wipe suction tube
clean.
Place suction tube in
appropriate cleaning fluid.
Close drain valve.
Switch power ON.
To save paint from hose and pump,
trigger gun into paint pail and
increase pressure. When cleaning
fluid appears, release gun trigger.
Turn pressure all the way down.
Open drain valve.
1/2+
Rotate and pull connector out to fully
extended position.
Screw connector
onto gun.
When finished, remove trigger clip
from gun handle. Rotate gun so
connector releases from valve slots.
Push and rotate gun until
connector pins are secure
in slots. This opens the
AutoClean valve.
Unscrew connector from gun.
Return connector into slots.
Install cover.
GRACO N.V. • Industrieterrein Oude Bunders
Slakweidestraat 31 • B-3630 Maasmechelen
Tel. (32) 89 770 700 • Fax (32) 89 770 777
Contractor, Silver and Flex Guns:
Remove trigger lock clip from filter housing. Slide open end over
back of handle. Rotate trigger
Lock trigger open. lock clip 90° to lock trigger open.
Close drain valve.
With clean fluid, briefly trigger gun
into waste pail several times to
clear any debris from front of gun.
Press display button until timer
appears and turn pressure control
knob halfway.
Install tip and guard and briefly trigger
gun into waiste pail to clean tip.
Reverse tip if necessary.
© 2002 Graco N.V. · Form No. 328009 E · 12/02 · Printed in Europe.
Graco Inc. is registered to I.S. EN ISO 9001.
All information, illustrations, and specifications in this document are based on the latest product information
available at the time of publication. The right is reserved to make changes at any time without notice.